Not sure if it will work if you use Optus Perk rewards or other discount tickets since it mentions full priced tickets.
See 3 movies or more between 23 June and 9 August to unlock a $2 ticket*.
Purchase a full priced ticket to three different movies screening between 23 June and 9 August and we will add a $2 2D General Admission ticket to your account to be redeemed between 11 August and 7 September 2016.
That’s a great deal to see a brand new movie for only $2*!
*Terms and conditions: Offer valid from 23 June to 9 August (inclusive). Members must have an active HOYTS Rewards membership and present their HOYTS Rewards card online or in cinema for each transaction to be eligible for this offer. Members must purchase a full priced adult, concession, senior, student, family or child ticket to at least 3 different movies screening during the promotional period to be eligible for this offer. One $2 2D General admission ticket will be allocated to qualifying member accounts on 10 August. The $2 2D General admission ticket will be valid for redemption on sessions screening between 11 August and 7 September 2016 only. Surcharges may apply for Xtremescreen and 3D sessions. Online bookings incur a $1.20 booking fee. $2 ticket not valid for redemption at HOYTS LUX and HOYTS IMAX®.
Good deal if you are a senior ($13 × 3 movies plus $2 ticket equals $41). For everyone else sticking with with Optus Perks $11 tickets will be cheaper.